Multiple vulnerabilities in the multicast subsystem of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to create a denial of service (DoS) condition. The issues are in IPv4 Multicast Source Discovery Protocol (MSDP) and IPv6 Protocol Independent Multicast (PIM).
The first vulnerability (Cisco bug ID CSCud36767 (registered customers only)) is due to insufficient checking of MSDP Source-Active (SA) messages received from a configured MSDP peer. An attacker who can send traffic to the IPv4 address of a device could exploit this vulnerability by sending a packet designed to trigger the issue to the affected device. A successful exploit could cause the affected device to restart.
The second vulnerability (Cisco bug ID CSCuy16399 (registered customers only)) is due to insufficient checking of packets encapsulated in a PIM register message. An attacker who can send a malformed IPv6 PIM register packet to a PIM rendezvous point (RP) could exploit the vulnerability. A successful exploit could cause the affected device to restart.